Door panel for a milling machine



FIG. 1 is a top and right side perspective view of my design for a door panel for a milling machine;

FIG. 2 is a rear and left perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a rear view thereof.

The broken lines show environmental structure only and form no part of the claimed design. 

CLAIM The ornamental design for a door panel for a milling machine, as shown and described. 